Meggitt vibro-meter VM600 - Rectification Techniques

HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
4-14
Rectification techniques
MPC4 / IOC4T CARD PAIR
4.5 Rectification techniques
RMS, Mean, Peak or Peak-Peak rectification is available for acceleration, velocity or
displacement values. The following formulae apply:
1- RMS Value
The above value (U
RMS
) can also be scaled to obtain the Scaled Mean and Scaled Peak
values:
• Scaled Mean
• Scaled Peak
• Scaled Peak-to-Peak
2- Mean Value
3- True Peak Value
4- True Peak-to-Peak Value
Notes
1. The averaging time T can be software-configured in order to maintain a relationship with the
fundamental frequency.
2. True Peak or True Peak-to-Peak values can be calculated for proximity probe measuring chains.
3. The RMS value is the standard calculation for accelerometer-based measuring chains.
U
out
U=
RMS
1
T
--- U
in
()
2
td⋅
0
T

=
U
out
2
2
π
-------U
RMS
× 0.900 U
RMS
×==
U
out
2U
RMS
×=
U
out
22× U
RMS
×=
U
out
1
T
--- U
in
td⋅
0
T

=
U
out
U
in
peak=
U
out
U
in
peak
positive
U
in
peak
negative
–=